Manual Thermona THERM EL 15 (page 3 of 37) (English)

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2. General use

The construction of THERM-EL electric boilers is designed for hot-water heating systems with induced

water circulation. They can be installed in central or individual-storey heating with induced circulation sealed or

open systems and they are characterized by an environmentally friendly operation without requirements for

venting of the combustion product. Service-free operation enables the installation of an external regulator, other

external regulating or controlling components (not included in the boiler delivery package!), simple equitherm

regulator or room thermostat integrated directly in the automatic controlling system which maintains the pre-set

room temperature. The electric boiler can be used as a universal source of heat for heating flats, small family

houses, resort houses and also as an alternative source to another main heat source of heating and hot water

preparation (also for transitional periods) – for heat pumps, accumulation systems or in previously installed

central or single-storey heating systems etc. To attain higher output levels, boilers can be connected into a

cascade format.

3. General characteristics of THERM – EL electric boilers

Therm-EL electric boilers are wall-mounted appliances designed for water heating in a heating system and

potentially for domestic hot water heating (hereinafter referred to as “DHW”) in an indirect heating storage

tank.

THERM-EL electric boilers are manufactured in three performance versions in the lower output category:

8, 15 and 23 kW. The higher output series offers the following three types: 30, 38 and 45 kW. Structural

design as well as controlling system of these boilers are almost identical to the lower output series.

The electric boiler is formed by a steel vessel with inbuilt heating bars, heating temperature probe and safety

thermostat (these components are all located under one cover in the upper part of the vessel). The vessel is made

from a varnished steel sheet and it is fitted with thermal insulation. Heating water inlet, on which a circular

pump is mounted, is welded at the bottom part of the boiler. A lug located in the upper part of the vessel is

adjusted to the cup for the boiler temperature sensor and emergency thermostat. Heating water outlet and

threaded sleeve pieces are also located in the upper part of the vessel. Heating bars (up to 6) are screwed in the

sleeve pieces. Total output of each heating bar is 7.5 kW (there are three separate heating bodies with the output

of 2.5 kW in each heat bar). An automatic vent valve is placed at the highest point of the water heating circuit.

The boiler control box enables connection of an external room thermostat, addition of interface for the boiler

cascade connection type, programmable (time) switch and MRC (mass remote control) tariff switch.

Switching and electric line protection of the boiler and output inlets for the heating bars are not

located in the boiler but they always form part of the electric distributor of the flat or house. Terminals of the

main wiring are concentrated in the right part of the boiler. A sufficiently rated output line contactor or switch

(correctly marked!) which are used for disconnecting the electric boiler from the power network must be

connected right next to the boiler during its installation.

♦ Boiler operation characteristics:

Operational stage of the boiler is launched when heating system temperature drops below the temperature

set on the boiler control panel or on the room thermostat. Control circuit of the heating bars becomes activated

and heating water inside the boiler body becomes heated gradually. After the required temperature has been

reached in the room (if a room thermostat is applied), the control microprocessor unit starts switching off the

heating bodies one by one and the heating of the water stops. At this moment the function of an adjustable

limited pump deceleration (in terms of time or temperature) becomes activated.

As standard, Therm-EL boilers are also fitted with emergency thermostat which delivers maximum safety.

It is connected to the control circuit of the integrated output contactor. The disconnection of the emergency

I Have an EL15 and cannot see how to connect a 3 way motorised valve. Manual shows position on diagram but how is connection physically made? Please help Submitted on 28-9-2022 at 18:47
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Thermona THERM EL 15 Manual

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